Get a group of people together on one call. You can add up to 25 people. You can share a group call with up to 25 people, anywhere in the world, and if everyone’s on Skype, it’s completely free. If you’re calling people who are on a mobile or landline, you’ll need a little Skype Credit or a subscription.

VSee's is a free video chat tool as well as a collaboration tool. You can collaborate with a colleague on a document even if that person doesn't have the software installed through screen sharing, and you can share that file by dragging the file onto your chat video. The free version supports video chats with up to four people simultaneously.